pipe_vertex_element::src_format doesn't have enough bits for PIPE_FORMAT_B10G10R10A2_UINT (257)
@mareko wrote that 8-bits should be enough for all vertex formats. Vulkan allows for PIPE_FORMAT_B10G10R10A2_UINT as a vertex format, I'm not sure it makes any sense as one, but gallium/lavapipe currently chokes on it.
Discuss. Open to lvp not supporting it as a vertex format, but wanted some input first.